Thats a good question. I know that getting cyp to hold at anything over 200mg or 225mg can be a pain in the arse without upping the ba/bb % but I don't know if blending it with a different ester will cause the same problems. The reason i'm not sure is because Test E over 250mg causes pain for some people, but i've made and used mixes of 200mgTest Cyp/200mg Test E for a total of 400mg/ml with no problem and no pain. Maybe someone else will chime in on this one. Don't know if it will hold but I do know that 100mg of prop will sting a bit.